Telephone-transmitter arm.



Patented July I7, |900.

(Application filed Mar. 22, 1900.)

(No Model.)

Il@ a Rn. 653,73I, Patented luly I7, |900. 5.( SUNNINGHAM.

muslo LEAF TURNER.

(Application led May 1, 1900.)

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JAMES F. CRAVEN, OF IITTSBURG, PENNSYLVANIA.

TELEPHONE-TRANSMITTER ARM.

SPECIFICATION forming part of Letters Patent No. 653,730, dated July 1'7, 1900. Application filed March 22, 1900. Serial No. 9.741. No model.)

To all whom t may concern.-

Beit known that I, JAMES F. CRAvnN, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, haveA invented a new and useful Improvement in Telephone-Transmitter Arms; and I do hereby declare the following to be a full, clear, and exact description thereof.

Myinvention relates to supporting-arms for telephone-transmitters, and applies more particularly to that kind in which the transmitter is held at some distance from the base and may be raised or lowered, so as to adapt it to the use of persons of different heights.

The object of my invention is to provide a transmitter-arm of this character that has the appearance of an ordinary solid transmitterarm, but which is stronger and more rigid than a solid arm, which is simple in construction, and in which the usual conducting cords or wires between the transmitter and the base are dispensed with and nevertheless a permanent electrical connection between the movable transmitter and the stationary base is maintained.

To this end my invention comprises a transmitter-arm composed of two separate conducting members having their meeting faces lying in close proximity and conforming to but insulated from each other, so that the united members have the appearance of a solid arm, said arm being provided at one end with suitable means for the attachment of the transmitter thereto and at the other end with means for adjusiably supporting it in the stationary base in such a manner as to prevent short-circuiting.

To enable others skilled in the art to make and use myinvention, I will describe the same more fully, referring to the' accompanying drawings, in Which- Figure l is a side view of my improved transmitter-arm. Fig. 2 is a longitudinal horizontal section of the same on the line 2 2, Fig. l, showing it mounted in the base, the latter being broken away to show the connection; and Fig. 3 is an end View of the arm.

As shown in the drawings, my transmitterarm is composed of the members l and 2, each formed of thin plate or sheet metal stamped into proper form, with. the meeting edges of the side flanges 3 conforming closely to each other and with the edges of the end anges 4 also conforming to each other, so as to form practically a closed end to the arm. The meeting edges of the members are separated by suitable insulation, (indicated by 5,) which may be hard cement, varnish, or japan. The end iiange 4 of one of the members is cut away, as at-, while the end ange of the other member is provided with the circular projecting portion 7, which ts into the recess 6, thereby holding the members in their proper relative position. united by means of the ber screw 8 and the disk 9, of liber or other` insulating material, secured to the end iianges 4 by means of the ber screws l0. The disk 9 is centrally apertured, as indicated at ll, While the flange 4 of one of the members is likewise apertured and threaded, as indicated at l2, the aperture l2 being less in diameter than the aperture 11, thereby exposing a portion of the metal of the member l. This is to enable a transmitter ot the type having a carbon back provided with a centrally-projecting screw to be readily connected to the transmitter-arm. The arm is supported in the base 13 by means of the journals 14 and l5, the journal 14 being screwed into a threaded aperture of the member l. If the journal l5 were secured to the member 2 in the same manner, the transmitter would be short-circuited, thereby rendering the telephone inoperative. To overcome this difficulty, the journal l5 is screwed into a threaded aperture in the metal plate 16, which is secured to the member2 by means of the ber screw 8 and the fiber screw 174 and is insulated therefrom by the'layer of insulating material 18. Each of the members l and 2 is provided at its rear end with a binding-screws 19 or other suitable means for the ready connection of the line-Wires.

The transmitter is mounted on the supporting-arm in any suitable manner, and proper electrical connection will be made with the 'members 1 and 2 by boring holes through the liber disk 9, such holes not being shown, for the reason that the position thereof would var according to the type of transmitter used.

hile I have shown the transmitter-arm composed of two shell-like members, my in- The members l and 2 are' vention is not limited thereto, since said members may be solid, having their meeting faces conforming to and insulated from each other, as will be readily understood; but for the sake of strength, lightness, and cheapness in manufacturing I prefer to make the arm of the shell-like members as shown. A further obj ect of making the members of stamped-up sheet metal is that thereby a hollow transmitter-arm is provided the hollow of which may be utilized for the conducting-wires, if desired.

I do not desire to be limited to the specic means for uniting the two conducting members of the transmitter-arm, as obviously other means than the liber screw and disk might be used, such as metal bolts or rivets suitably insulated from one or both members; nor do I wish to be limited to the speciflc means illustrated for insulating the base fromone of the conducting members. It is obvious that the plate 16 instead of being made of metal might be made of liber and united directly to the member 2 by means of metal screws or other convenient fastening devices. The ber itself being an insulator no other insulation would be required.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A transmitter-arm comprising two conducting members lying side by side and having their meeting faces conforming to each other to form a single arm, means for uniting said members and suitable insulation betweenV the meeting facesV of'sa'id members.

2. A transmitter-arm comprising two conducting members connected directly to and insulated from each other, and a non-conducting disk secured to and uniting the outer ends of said members.

3. Atransmittor-arm comprising two shelllike conducting members connected directly to and insulated from each other, thereby .forming a hollow transmitter-arm.

4. A transmitter-arm comprising two shelllike conducting members having their meeting edges conformingv to each other to form a single hollow arm, means for 'uniting said members and suitable insulation between the meeting edges of said members.

5. A transmitter-arm comprising two conducting members connected directly to and insulated from each other, and an-insulated supporting-plate connected to one of' said` members.

6. A transmitter-arm comprising two conducting members connected directly to and insulated from each other and a metal snpporting plate connected to and insulated from one of said members.

In testimony whereof I, the said .I AMES F. CRAVEN, have hereunto set my hand.

JAMES F. CRAVEN. lVitnesses:

G. C. RAYMOND, ROBERT C. Tor'rnN. 

